ks are located in Phoe- through a hole in the door, until the iron nixville, in the Schuylkill Valley, Pa., and were founded in boils up or " ferments," as it is called. 1790. At the present time over fifteen hundred hands are This fermentation is caused by the com- constantly employed, and the… … Fio 4.—THE ENGINE BOOM. Flo. ».—THE BOLLS. and subjected to the process of ' 1873 SCIENTIFIC AMERICAN, INC.
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